The 5th Annual China PHP Conference

posix_getppid

(PHP 4, PHP 5, PHP 7)

posix_getppidReturn the parent process identifier

Description

int posix_getppid ( void )

Return the process identifier of the parent process of the current process.

Return Values

Returns the identifier, as an integer.

Examples

Example #1 Example use of posix_getppid()

<?php
echo posix_getppid(); //8259
?>

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User Contributed Notes 2 notes

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divinity76 at gmail dot com
7 months ago
WARNING, when using proc_open, your child will NOT get the parent php process's PID by using posix_getppid() , it will actually get the pid of a shell ( /bin/sh ? ) started by php, which in turn starts the child.  i don't currently have a good workaround for this, but i'm working around it by having the parent write it's pid to a file and having the chidren read the file
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divinity76 at gmail dot com
1 month ago
when using proc_open, the child's ppid is NOT your php script, but rather a shell started by proc_open's pid. to get your pid, your proc_open child needs to get the parent's parent's (aka grandparent's) pid. here's a way to do that in PHP on linux:

function posix_getpppid(): int {
    return ( int ) (explode ( " ", file_get_contents ( "/proc/" . posix_getppid () . "/stat" ) ) [3]);
}

(thanks to TML @ irc.freenode.net/##PHP for the technique)

(i said most of this in a previous comment, but i didn't have a good solution for it. now i have. if someone with the privileges read this, can you delete this notice and my previous comment please?)
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